Crank-shaft indicating and marking machine



April 30, 1929. Q STQDDARD 1,711,068

CRANK SHAFT INDICATING AND MARKING MACHINE Filed De 28, 1926 4Sheets-Sheet 1 April 30, 1929. STODDARD 1,711,068

CRANK SHAFT INDIGATING AND MARKING MACHINE Filed Dec. 28, 1926 4Sheets-Sheet 2 5 w is? --1 April 30, 1929.

H. G. STODDARD CRANK SHAFT INDTCATING AND MARKING MACHINE Filed Dec. 28,1926 4 Sheets-Sheet mm SB April 30, 1929. STQDDARD 1,711,068

CRANK'SHAFT INDICATING AND MARKING MACHINE Filed Dec. 28, 1926 4Sheets-Sht 4 w a? My 2252? all) Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

HARRY G. STODDARD, OF "WORCESTER. MASSACHUSETTS, ASSIGNOR TO WYMAN-GOR-DON COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA-CHUSETTS.

CRANKfiHAFT INDICATING AND MARKING MACHINE.

Application filed December 28, 1926. Serial No. 157,559.

This inwcntion while capable of general application to machines forindicatingcrank shafts and similar products, is particularly designed asan improvement in the general type of crank shaft indicating and markingmachine shown in the prior patent to Damercll. No. 1.595,?13, issuedAugust 10,1926.

111 machines of this general type, provision is made for centering theshaft with reference to certain selected chat etc istics of the shaft,and for marking or drilling the center holes therein. It is alsodesirable to mark a definite angular point on some portion of the crankshaft, which may be used as an index to position the shaft in a definiteangular position in the lathe or other machine in which the shaft is tobe finished, so that the crank pins may be machined as indicated and sothat there will be sail lent stock available for each crank pin.

In the machine shown in the prior patent, this mark for indicatingangular position was made by a punch moyable on a llXBtl path 011 themachine frame. This punch produced a mark of very slight depth, whichwas frequently entirely removed from the shaft in finishing, Whereas itis desirable that the indicating mark be permanently preserved forreference after the finishing ofthc shaftis completed. y

i one object of myim'cntion to provide means for drilling a permanentmark in an angularly delined position in a crank shaft arm. which markmay be used as a guide for further machine operations. A furtheroh jcctto proride means to control the actuation of the drill in definiterelation to the movement of the drill toward and from the work.

in the preferred form, I design the mechanism. to rotate normally atrelatively slow speed which is automatically increased to high speed asthe drill is advanced toward the Work. and which returns to normal orslow speed as the drill is withdrawn from the Work.

lily invention further relates to arrange ments and combinations ofparts which will be hereinafter described andmore particularly pointedout in the appended claims.

A, preferred form of the invention is shown in. the drawings in WhichFig. l is a partial plan View of a crank shaft indicating machine,having my im prwements applied thereto; i

Fig. a sectional side elevation, taken alongthe line 22 of Fig. 1; l

l ig. 3 a side elevation, partly in section, of my improved drillingmechanism, looking in the direction of the arrow 3 in Fig. 1;

Fig. 4. is a sectional plan View of the drilling mechanism;

5 is a front elevation of the'drilling partly in section, takensubstanmechanism, u

tially along the line 5- 5 in Fig. 4;

Fig. (5 is a partial side elevation of the drilling nicchanism withcertain partsshown loosely supported in forked guides 10. and theseveral .illlili pins thereof are simultaneously engaged by a series ofcentering; and iridicat ing members 11, 12 and 13, as shown in Fig. 2.

The members 11. are manually adjustable,

by a hand Wheel 14 to rock the shaft C about its axis, so as to averagethe inaccuracies of the crank pins and to bring the shaft to anindicated position Where each crank pin will have sul'licient stock onall sides to permit finishing thereof.

Indicating scales 15 and 16 on the slide frames 17 and 18 enable theoperator to determine at a glance Whether or not a particular. crank pinis within the required limits for satisfactory finishing. By the use ofthe hand heel 1% the operator is usually able to lind a position inwhich the inaccuracies of the crank pins will be olfset against eachother; and each pin. Willbe in a position in. which it can besatisfactorily machined. It is commonto provide a Sep arate indicatingdevice forcach of the crank pins #1, andqltti and a single indi-,

cating deyice for the double center crankpins #3 and #4. i

The mechanism thus far described is as shown in the Damerell patent, towhich refrrence may be made for a more complete disclosure of thedetails relating thereto.

I have shown my improved drilling mechanism as applied to one of theslide frames for the indicating members. The mechanism is shown mountedupon a slide frame 18 (Figs. 3 and 4) and comprises a drill spindle 21having one end guided in a bearing 22 on the slide frame 18, and havingits opposite end supported in hearings in a sliding block 23. Theintermediate portion of the spindle 21 extends freely through a spiralgear 2% but is keyed thereinso that it will rotate therewith.

The block 23 (Fig. 6) has gaged by a pinion 27 on a rock shaft 28 7)mounted in hearings in the frame having an arm 29 secured. to the outerend thereof. A handle or operating member 30 is loosely pivoted to swingabout the axis of the rock shaft 28 and a stud 31 fixed in the arm 29extends outward into an enlarged opening 32 (Fig. 3) in the operatingmember 30, thus providing a lost motion connection therewith.

A plunger 33 (Fig. 3) engages a spring 34 in a pocket 35 in the end ofthe frame 18 and acts to yieldingly withdraw the blockQS and spindle 21from the work. A stop screw 37 (Fig. 4) engages an abutment 38 and maybe adjusted to limit the depth of the hole which is drilled in thecrankshaft.

A drill 39 is secured to the spindle 21 by any usual chuck 40 and theouter end of the drill is preferably supported by a hardened a rack .36on- (Fig.

bushing 41 closely adjacent the surface of the crankshaft to be drilled.

A second spiral gear 45 (Fig. 5) meshes with the spiral gear 24previously described. The gear 45 is mounted on a short shaft 46extending into a rotor casing 47 and having the rotor 18 (Fig. 3) of anair motor mounted thereon. Air under pressure is supplied through a pipe19 to a valve casing 50, in which a valve 51 is slid-ably mounted. Apassage 52 conveys the air under pressure from the valve 51 to an inlet53 closely adjacent the rotor 48.

The valve 51 is normally closed by a spring 5 1 and has a valve stem 55extending upward and above the casing 50. A bleed opening 56 maintains aconstant restricted connection between the air supply and the passage52, even when the valve 51 is closed, and the rotor 48 is thuscontinuously rotated at relatively slow speed.

A valve lever 60 is pivoted at 61 on the cars ing 50, with its free endresting on the valve stem 55. A cam roll 62 on the lever 60 is engagedby a cam plate 63 formed on the end of the handle member 30.

When the member 30 is moved angularly to advance the. drill 39 towardthe work, the

first action of the lever 30 is to depress the roll 52, thus opening thevalve 51 and greatly increasing the speed of the rotor -18. This actionlargely takes place during the lost motion movement of the lever 30relatively to the stud 31, so that the drill is rotating at hi gh speedbefore it is advanced toward the work.

Continued movement of the lever 30 maintains the high speed and advancesthe drill 39 until the stop 37 engages the abutment 38. As soon aspressure on the lever 30 is released, the spring 34 will return theparts to outward inoperative position. at the same time allowing thevalve 51 to close and greatly reducing the speed of the rotor is.

As the slide frame 18 moves in a tired path to ard the axis of themachine, the drill (ill always advances in a. definite angular positionrelative to the indicating devices, and drills a hole which ahvays has adefinite angular relation to the llltllfii ted centers of the crankpins.

If this hole is thereafter rightly used to determine the proper angula rposition of the crankshaft in the finishing machine, the crank pins willbe so disposed that sutlicient stock will be PlOVlClGClOl'l all sidesthereof for complete finishing. If the shaft is not correctly placed inthe machine, one or more crankpins may fail to finish out properly. inwhich event the drilled hole is available as a check, to determinewhether or not the crankshaft was properly placed in the finishing.

machine, thus determining whether or not the defective work should becharged against the manufacturer of the forging or against the machinistwho finished the shaft. u

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed otherwise than as setforth in the claims, but what I claim is 1. In a c 'ank shaft indicatingand marking machine, means to selectively position a crank shaftin saidmachine, and means to drill a hole in said crank shaft while thuspositioned and in a definite angular relation to the indicated crank pincenters, comprising means to advance the drill toward said shaft, andmeans to increase the speed of said drill prior to its advance movement.

2. In a crank shaft indicating and marking machine, means to selectivelyposition a crank shaft in said machine, means to advance a drill along adefinite predetermined line towards said crank shaft, and means toautomatically increase the speed of the drill prior to the advancemovement of the drill.

3 In a crank shaft indicating and marking machine, means to center andselectively position a crank shaft therein, a drilling mechanism movablealong a predetermined path toward and from the centered shaft, and asingle operative device effective to in Ill) a, we the speed of thedrill and to thereafter start and effect an advance of the drill towardthe Work.

4. In a crank shaft indicating and mark ing machine, a drillingmechanism comprising a drill, means to normally rotate said drill atslow speed, and a single device effective to increase the speed of saiddrill and to thereafter start and effect an advance of said drill towardthe crank shaft.

In a crank shaft indicating and marking machine, a drilling mechanismcomprising a drill, an air motor to rotate said drill, a valvecontrolling said air motor, and a single manually operated deviceeffective to open said valve and to thereafter startand effect anadvance of said drill toward a crank shaft selectively positioned insaid machine.

6. In a crank shaft indicating and marking machine, a drilling mechanismcomprising a drill, an air motor to rotate said drill, a valvecontrolling said air motor, a casing for said motor having a restrictedbut constantly open air inlet to said motor, and means to open saidvalve and to advance said drill towards a crank shaft selectivelypositioned in said machine.

7. In a crank shaft indicating and marking machine, a drilling mechanismcomprising a drill, an air motor to rotate said drill, a valvecontrolling said air motor, and a single manually operated deviceeffective to open said valve and to advance said drill toward a crankshaft selectively positioned in said machine, said operating deviceincluding a lost motion connection between said mechanism and saiddevice, causing a delay in the advance movement of the drill until thespeed thereof has been increased. 8. In a crank shaft indicating andmarking machine, means to selectively position a crank shaft in saidmachine, comprising a longitudinally extending bed, a crank posi tioningslide thereon supported for movement transversely of said bed toward andfrom a crank of said shaft, and means to drill a hole in said crankshaft while positioned and in definite angular relation to theindicating crank pin centers, comprising a drill spindle, hearings onsaid slide adapted to support said spindle, and actuating means for saidspindle effective to automatically increase the speed of the drill priorto the advance movement of the drill, also positioned on said slide.

9. In a crank shaft indicating and marking machine, means to selectivelyposition a crank shaft in said machine, means to advance a drill along adefinite predetermined line along said crank shaft, and means toautomatically increase the speed of the drill prior to the advancemovement of the drill, comprising a valve and a manually actuated cameffective to operate said valve.

10.- In a crank shaft indicating and mark ing machine, a drillingmechanism comprising a drill, means including a valve to normally rotatesaid drill at slow speed, and cam means effective to open said valve toincrease the speed of said drill at a predetermined time, and said firstmeans effective to thereafter start the advance movement of said drilltoward the crank shaft.

In testimony whereof I have hereunto afiixed my signature.

HARRY G. STODDARD.

